const download0 = (data: Blob, fileName: string, mineType: string) => {
    // 创建 blob
    const blob = new Blob([data], { type: mineType })
    // 创建 href 超链接，点击进行下载
    window.URL = window.URL || window.webkitURL
    const href = URL.createObjectURL(blob)
    const downA = document.createElement('a')
    downA.href = href
    downA.download = fileName
    downA.click()
    // 销毁超连接
    window.URL.revokeObjectURL(href)
}

const download = {
    // 下载 Excel 方法
    excel: (data: Blob, fileName: string) => {
        download0(data, fileName, 'application/vnd.ms-excel')
    },
    // 下载 Word 方法
    word: (data: Blob, fileName: string) => {
        download0(data, fileName, 'application/msword')
    },
    // 下载 Zip 方法
    zip: (data: Blob, fileName: string) => {
        download0(data, fileName, 'application/zip')
    },
    // 下载 Html 方法
    html: (data: Blob, fileName: string) => {
        download0(data, fileName, 'text/html')
    },
    // 下载 Markdown 方法
    markdown: (data: Blob, fileName: string) => {
        download0(data, fileName, 'text/markdown')
    },
    // 下载图片（允许跨域）
    image: (url: string) => {
        const image = new Image()
        image.setAttribute('crossOrigin', 'anonymous')
        image.src = url
        image.onload = () => {
            const canvas = document.createElement('canvas')
            canvas.width = image.width
            canvas.height = image.height
            const ctx = canvas.getContext('2d') as CanvasDrawImage
            ctx.drawImage(image, 0, 0, image.width, image.height)
            const url = canvas.toDataURL('image/png')
            const a = document.createElement('a')
            a.href = url
            a.download = 'image.png'
            a.click()
        }
    },
}

export default download
